Now you know. According to a NASA flight engineer on a International Space Station mission, space smells like “an arc welding torch repairing heavy equipment for a small logging outfit.” Or more succinctly, “pleasant sweet-smelling welding fumes.”

Of course, there’s always somebody to burst your bubble. One theory is the smell has something to do with LCVG and PLSS, which are responsible for regulating and radiating heat away form the user (respectively). Out in the space vacuum, these chemicals may get vaporized, and hence, that “sweet-smelling welding fume.”